Boaters must be careful because they jump out of the water when startled by the sound of a boat motor. One may go for many miles and see no sign of them, then encounter them suddenly. Most of the time their jumping provides entertainment but getting hit by one on a fast moving boat can be painful. The problem is not as frightening as the mock poster at the right but hopefully something can be done to reduce their numbers.
Other persons and entities worry about other, more commercial effects, as evidenced in an Associated Press report headlined “Michigan may sue Illinois over Asian carp invasion.”